<template>
  <transition name="van-fade">
    <div v-if="is_loading" class="loading_box flex-center-center">
      <div class="content">
        <div class="loader"></div>
      </div>
    </div>
  </transition>
</template>

<script>
  export default {
    computed: {
      is_loading() {
        return this.$store.state.loading
      }
    },
    methods: {
      // 关闭loading
      switch_loading() {
        this.$store.commit('switch_loading')
      }
    }
  }
</script>

<style scoped>
  .loading_box {
    width: 100%;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 10000;
  }
  .content {
    width: 100px;
    height: 100px;
    background: #00000096;
    border-radius: 5px;
    position: relative;
  }
  .loader {
    position: relative;
    width: 2.5em;
    height: 2.5em;
    transform: rotate(165deg);
  }
  .loader:before,
  .loader:after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    display: block;
    width: 0.5em;
    height: 0.5em;
    border-radius: 0.25em;
    transform: translate(-50%, -50%);
  }
  .loader:before {
    animation: before 2s infinite;
  }
  .loader:after {
    animation: after 2s infinite;
  }

  @keyframes before {
    0% {
      width: 0.5em;
      box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
    }
    35% {
      width: 2.5em;
      box-shadow: 0 -0.5em rgba(225, 20, 98, 0.75), 0 0.5em rgba(111, 202, 220, 0.75);
    }
    70% {
      width: 0.5em;
      box-shadow: -1em -0.5em rgba(225, 20, 98, 0.75), 1em 0.5em rgba(111, 202, 220, 0.75);
    }
    100% {
      box-shadow: 1em -0.5em rgba(225, 20, 98, 0.75), -1em 0.5em rgba(111, 202, 220, 0.75);
    }
  }
  @keyframes after {
    0% {
      height: 0.5em;
      box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
    }
    35% {
      height: 2.5em;
      box-shadow: 0.5em 0 rgba(61, 184, 143, 0.75), -0.5em 0 rgba(233, 169, 32, 0.75);
    }
    70% {
      height: 0.5em;
      box-shadow: 0.5em -1em rgba(61, 184, 143, 0.75), -0.5em 1em rgba(233, 169, 32, 0.75);
    }
    100% {
      box-shadow: 0.5em 1em rgba(61, 184, 143, 0.75), -0.5em -1em rgba(233, 169, 32, 0.75);
    }
  }

  .loader {
    position: absolute;
    top: calc(50% - 1.25em);
    left: calc(50% - 1.25em);
  }
</style>
